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It's a complicated job, and usually takes about 8 hours to do the full service if you're familiar with the car's mechanicals, you have a good array of tools (air tools help a lot), you're familiar with what you're doing, and with how to disassemble everything (including removing the front of the car - I'm not joking). There's more to the job than just the belt too - you need to replace the timing belt, timing tensioner, water pump, thermostat, serpentine belt, and serpentine tensioner. If your cam seals are leaking (which is also known to happen), you'd need those and plan for a couple more hours as well, due to the care that must be taken not to scratch or score the cam end caps.

Audi recently increased the service interval on these belts from 60,000 to 80,000 miles. You cannot do a timing belt inspection - you must replace it at the specified interval due to the fact that a belt may look good but can still fail due to undetectable stressors in the belt itself when it reaches this mileage.

You do not say which engine variant you have in your car but 80,000 is now the general belt interval that is specified.

I know this probably isn't the response you want but the best recommendation I can give you is to get the Haynes repair manual on your vehicle from the local auto parts store. There are so many steps involved it's hard to put them in this small of a space.

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Even your car Audi A4 1.9 TDI has got 55000 km and the timing belt replacement is due at 90000 km, the car was made in 2003. I strongly recommend you to change now the timing belt in order to prevent any risk!

Every 60,000 miles. Change the timing belt, accessory serpentine belt, hydraulic timing tensioner, tensioner and idler rollers, tensioner relay arm, water pump, thermostat, and coolant. A dealer will charge you $1100 or more, and an independent European specialist probably $650-750. If you're in range of the southern tier of NY, I can do it for you (I specialize in Audi and VW). Order your parts online and I'll do the work for $250 in labor.

If it's anything like the six cylinder engines from Audi, which I'm very familiar with, and from what I remember of the V8, you have a timing belt that drives the water pump, crank, and exhaust cams, and also includes a tensioner and an idler roller. The timing chains come into play in the cylinder heads. What Audi did was to only drive the exhaust cams off of the crank, using the timing belt, and inside each cylinder head there is a timing chain assembly that is used to drive the intake cams off the exhaust cams. On a periodic service (like the timing service) you only need to do the timing belt. The timing chains are only replaced if the tensioners fail - you'll know this by a diesel-like clatter from the cylinder heads. Failure of the chain drive assemblies is very rare, which is good because they're incredibly expensive (on the V6 engines they're upwards of $700 each). If you're doing this job because it's due based on mileage, don't touch the timing chains in the cylinder heads - only change the timing belt, tensioner roller, relay arm, hydraulic tensioner, idler pulley, water pump, and serpentine belt. You can leave the chains alone.

Audi recently increased the service interval on these belts from 60,000 to 80,000 miles. You cannot do a timing belt inspection - you must replace it at the specified interval due to the fact that a belt may look good but can still fail due to undetectable stressors in the belt itself when it reaches this mileage.

You do not say which engine variant you have in your car but 80,000 is now the general belt interval that is specified.